Odderon and photon exchange in electroproduction of pseudoscalar mesons E.R. Berger, A. Donnachie, H.G. Dosch, W. Kilian, O. Nachtmann and M. Rueter Eur. Phys. J. C, 9 3 (1999) 491-501 Published online: 28 May 1999 DOI: 10.1007/s100520050043